Milling structure for numerical control machining center

Abstract

The utility model relates to the technical field of machining, and discloses a milling structure for a numerical control machining center, which comprises a fixed shaft, the end face of the fixed shaft is fixedly connected with a tool apron, the side wall of the tool apron is provided with a sliding chute, and a limiting component is arranged in the sliding chute. According to the milling structure for the numerical control machining center, the longitudinal positions of the moving block and the tool bit are limited through the limiting block, the guide groove is slidably connected with the guide rail, the transverse positions of the moving block and the tool bit are limited through the guide rail, and it is guaranteed that the tool bit cannot deviate due to longitudinal vibration or impact of cutting force in the cutting process; rebounding or vibration interference caused by cutting force is prevented, the longitudinal position precision during machining is guaranteed, the machining precision of the tool bit is improved, after the tool bit is contracted, the movable block is fixed to the bottom of the fixed block under the elastic effect of the spring, and therefore the situation that the limiting block interferes with limiting of the guide block next time is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical processing technical field, concretely is a kind of milling structure for numerical control machining center. BACKGROUND

[0002] Numerical control machining center is developed from numerical control milling machine, and the difference between numerical control machining center and numerical control milling machine is that it can automatically exchange processing tool, and numerical control machining center can complete the processing that ordinary equipment cannot complete, and it is more suitable for single processing or small batch production of multiple varieties with complex shape and high precision.

[0003] According to the milling structure for numerical control machining center (announcement number: CN210731126U) disclosed in the above application, the fixed shaft is connected to the machine tool at the upper end, and the lower end of the fixed shaft is provided with a fixed disc, and the lower side of the fixed disc is provided with a tool holder, and the upper end of the tool holder is provided with a groove, and a sliding groove is arranged on the tool holder, and a moving block is arranged in the sliding groove, and two groups of hydraulic rods are arranged on the upper end of the moving block, and a fixed block is arranged on the upper end of the tool holder, and the hydraulic rod is arranged on the fixed block.

[0004] However, the above-mentioned milling structure indirectly fixes the tool by pushing the moving block with the hydraulic rod during actual use, and the tool will bear cutting force, inertia force and vibration impact force during processing, so the tool holder and the moving block need to bear complex forces during processing, which may cause slight deformation of the overall structure, thereby affecting the supporting force of the hydraulic rod on the moving block, and affecting the limiting function and processing stability of the tool. In view of this, we propose a milling structure for numerical control machining center. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a milling structure for numerical control machining center to solve the problems in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a milling structure for numerical control machining center, comprising a fixed shaft, the end face of the fixed shaft is fixedly connected with a tool holder, the side wall of the tool holder is provided with a sliding groove, the inside of the sliding groove is provided with a limiting assembly, and the limiting assembly comprises:

[0007] A guide rail is fixedly connected to the inner wall of the sliding groove.

[0008] A hydraulic cylinder is fixedly connected to the top end face of the mounting bracket, the output end of the hydraulic cylinder is fixedly connected with an output shaft, the end of the output shaft away from the hydraulic cylinder is fixedly connected with a moving block, and the side wall of the moving block is provided with a guide groove.

[0009] The guide block is fixedly connected to the side wall of the output shaft, the side wall of the output shaft is fixedly connected with a fixed block, and the bottom end face of the fixed block is provided with a mounting groove;

[0010] The movable block is sleeved on the side wall of the output shaft, and the top end face of the movable block is fixedly connected with a spring;

[0011] The limiting block is fixedly connected with the elastic telescopic rod away from the inner wall of the sliding groove, and the limiting block is fixedly connected with the end of the elastic telescopic rod away from the inner wall of the sliding groove.

[0012] Preferably, the bottom end face of the movable block is fixedly connected with a connecting ring, and the outer diameter of the connecting ring is equal to that of the movable block.

[0013] Preferably, the bottom end face of the movable block is fixedly connected with a connecting ring, and the outer diameter of the connecting ring is equal to that of the movable block.

[0014] Preferably, the cross section of the guide block is in inverted trapezoidal shape, the cross section of the movable block is in trapezoidal shape, the guide block is movably connected with the limiting block, and the movable block is movably connected with the limiting block.

[0015] Preferably, the end of the spring away from the movable block is fixedly connected with the inner top face of the mounting groove, the spring is sleeved on the outer wall of the output shaft, and the spring drives the movable block to move towards the fixed block.

[0016] Preferably, the guide block is provided with a large-diameter end and a small-diameter end, the large-diameter end is equal to the inner diameter of the connecting ring, so that the connecting ring can wrap the gap between the guide block and the movable block.

[0017] Compared with the prior art, the milling structure for the numerical control machining center has the following beneficial effects:

[0018] 1. The milling structure for the numerical control machining center is provided with the limiting assembly, the limiting block limits the longitudinal position of the moving block and the tool head, the guide groove is slidably connected with the guide rail, the guide rail limits the transverse position of the moving block and the tool head, the tool head cannot deviate in the cutting process due to longitudinal vibration or impact of the cutting force, rebound or vibration interference caused by the cutting force is prevented, the longitudinal position precision during machining is ensured, the machining precision of the tool head is improved, after the tool head is retracted, the movable block is fixed at the bottom of the fixed block under the elastic action of the spring, and no longer has redundant degrees of freedom, so that interference of the limiting block on the guide block in the next time is avoided.

[0019] 2. The milling structure for the numerical control machining center, the gap between the guide block and the movable block is wrapped by the connecting ring, so that a smooth and continuous surface is formed at the transition of the two, avoiding the problem of tool head shrinkage failure caused by the insertion of the limiting block into the gap between the movable block and the guide block during resetting or movement. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the tool holder structure of the utility model;

[0022] Figure 3 It is a schematic diagram of the limiting assembly structure of the utility model;

[0023] Figure 4 It is a schematic diagram of the movable block structure of the utility model.

[0024] In the figure: 1, fixed shaft; 2, tool holder; 3, sliding groove; 4, limiting assembly; 401, guide rail; 402, mounting bracket; 403, hydraulic cylinder; 404, output shaft; 405, moving block; 406, guide groove; 407, guide block; 408, fixed block; 409, mounting groove; 410, movable block; 411, spring; 412, elastic telescopic rod; 413, limiting block; 5, connecting ring; 6, tool head. DETAILED DESCRIPTION

[0025] As Figures 1-4 shown, the utility model provides a technical scheme: a kind of milling structure for the numerical control machining center, including fixed shaft 1, the end surface of fixed shaft 1 is fixedly connected with tool holder 2, the side wall of tool holder 2 is equipped with sliding groove 3, limiting assembly 4 is arranged in the inside of sliding groove 3, limiting assembly 4 includes guide rail 401, mounting bracket 402, hydraulic cylinder 403, output shaft 404, moving block 405, guide groove 406, guide block 407, fixed block 408, mounting groove 409, movable block 410, spring 411, elastic telescopic rod 412, limiting block 413.

[0026] Guide rail 401 is fixedly connected in the inner wall of sliding groove 3, the inner wall of sliding groove 3 is fixedly connected with mounting bracket 402, hydraulic cylinder 403 is fixedly connected at the top end surface of mounting bracket 402, the output end of hydraulic cylinder 403 is fixedly connected with output shaft 404, the end, away from hydraulic cylinder 403, of output shaft 404 is fixedly connected with moving block 405, the side wall of moving block 405 is equipped with guide groove 406, guide groove 406 is slidably connected with guide rail 401, the bottom end surface of moving block 405 is fixedly connected with tool head 6, the number of limiting assembly 4 and tool head 6 is provided with several groups, and several groups of limiting assembly 4 and tool head 6 are arranged at the side wall of tool holder 2 with equal intervals.

[0027] The guide block 407 is fixedly connected to the side wall of the output shaft 404. The side wall of the output shaft 404 is fixedly connected to the fixing block 408. The bottom end face of the fixing block 408 is provided with a mounting groove 409. The end of the spring 411 away from the movable block 410 is fixedly connected to the inner top surface of the mounting groove 409. The spring 411 is sleeved on the outer wall of the output shaft 404. The spring 411 pulls the movable block 410 to move towards the fixing block 408.

[0028] The movable block 410 is sleeved on the side wall of the output shaft 404. A spring 411 is fixedly connected to the top end face of the movable block 410. An elastic telescopic rod 412 is fixedly connected to the inner wall of the slide groove 3. The limiting block 413 is fixedly connected to the end of the elastic telescopic rod 412 away from the inner wall of the slide groove 3. The cross-section of the guide block 407 is inverted trapezoidal. The cross-section of the movable block 410 is trapezoidal. The guide block 407 is movably connected to the limiting block 413. The movable block 410 is movably connected to the limiting block 413.

[0029] In one embodiment of this utility model, the hydraulic cylinder 403 pushes the output shaft 404 and the moving block 405 down, and the guide block 407 pushes open the limiting blocks 413 on both sides, so that the guide block 407 moves to below the limiting block 413. Then, the limiting block 413 is reset under the elastic action of the elastic telescopic rod 412. The limiting block 413 limits the longitudinal position of the moving block 405 and the cutter head 6. The guide groove 406 is slidably connected to the guide rail 401. The guide rail 401 limits the lateral position of the moving block 405 and the cutter head 6, ensuring that the cutter head 6 will not deviate due to longitudinal vibration or cutting force impact during the cutting process, preventing rebound or vibration interference caused by cutting force, and ensuring the longitudinal position accuracy during processing. The moving block 405 and the guide rail 401 are slidably connected through the guide groove 406. The guide rail 401 ensures that the moving block 405 moves smoothly along the predetermined path, and at the same time limits its lateral position, preventing the cutter head 6 from lateral displacement during processing, restricting the lateral degree of freedom of the cutter head 6, and improving the processing accuracy of the cutter head 6.

[0030] When the cutter head 6 needs to be retracted, the hydraulic cylinder 403 first continues to push the output shaft 404, causing the movable block 410 to open the limit block 413. Then the hydraulic cylinder 403 retracts, and the limit block 413 pushes the movable block 410 towards the guide block 407, causing the guide block 407 to abut against the limit block 413. Then the hydraulic cylinder 403 retracts. At this time, since the movable block 410 and the guide block 407 are together, the movable block 410 opens the limit block 413 and takes the guide block 407 over the limit block 413, thereby realizing the retraction of the cutter head 6. At this time, the movable block 410 is fixed at the bottom of the fixed block 408 under the elastic action of the spring 411 and no longer has extra degrees of freedom, thus avoiding interference from the limit block 413 to the limit of the guide block 407 in the next operation. When one cutter head 6 is being processed, the remaining movable blocks 405 are retracted into the tool holder 2 to avoid the remaining cutter heads 6 affecting the workpiece when there are many cutter heads 6.

[0031] In addition, a connecting ring 5 is fixedly connected to the bottom end face of the movable block 410. The outer diameter of the connecting ring 5 is equal to that of the movable block 410. The guide block 407 is provided with a large diameter end and a small diameter end. The large diameter end is equal to the inner diameter of the connecting ring 5, so that the connecting ring 5 can wrap around the gap between the guide block 407 and the movable block 410, thereby forming a smooth and continuous surface at the transition between the two. This avoids the problem that the limit block 413 will be inserted into the gap between the movable block 410 and the guide block 407 during the reset or movement process, causing the cutter head 6 to fail to retract.

[0032] In this invention, during use, the hydraulic cylinder 403 pushes the output shaft 404 and the moving block 405 downwards. The guide block 407 pushes open the limiting blocks 413 on both sides, causing the guide block 407 to move below the limiting blocks 413. Then, the limiting blocks 413 reset under the elastic action of the elastic telescopic rod 412. The limiting blocks 413 limit the longitudinal position of the moving block 405 and the cutter head 6. The guide groove 406 is slidably connected to the guide rail 401, which limits the lateral position of the moving block 405 and the cutter head 6, ensuring the longitudinal position accuracy during processing. The moving block 405 and the guide rail 401 are slidably connected through the guide groove 406, ensuring the longitudinal position accuracy during processing. The movable block 405 moves smoothly along the predetermined path. When the cutter head 6 retracts, the hydraulic cylinder 403 first continues to push the output shaft 404, causing the movable block 410 to open the limit block 413. Then the hydraulic cylinder 403 retracts, and the limit block 413 pushes the movable block 410 towards the guide block 407, causing the guide block 407 to abut against the limit block 413. Then the hydraulic cylinder 403 retracts. At this time, since the movable block 410 and the guide block 407 are together, the movable block 410 opens the limit block 413 and takes the guide block 407 over the limit block 413 together, thereby realizing the retraction of the cutter head 6 and avoiding interference from the limit block 413 on the limit of the guide block 407 in the next operation.

[0033] The utility model has made the detailed description to the utility model generally above, but can make some modification or improvement to it on the basis of the utility model, this is obvious to the general skilled person in the technical field. Therefore, the modification or improvement without departing from the utility model thought spirit, all are within the protection scope of the utility model.

Claims

1. A milling structure for a numerical control machining center, comprising a fixed shaft (1), an end surface of the fixed shaft (1) being fixedly connected with a tool holder (2), characterized in that: The side wall of the tool holder (2) is provided with a sliding groove (3), the inside of the sliding groove (3) is provided with a limiting assembly (4), the limiting assembly (4) comprises: A guide rail (401) is fixedly connected to the inner wall of the sliding groove (3); A hydraulic cylinder (403) is fixedly connected to the top end face of the mounting bracket (402), the output end of the hydraulic cylinder (403) is fixedly connected with an output shaft (404), one end of the output shaft (404) away from the hydraulic cylinder (403) is fixedly connected with a moving block (405), the side wall of the moving block (405) is provided with a guide groove (406); A guide block (407) is fixedly connected to the side wall of the output shaft (404), the side wall of the output shaft (404) is fixedly connected with a fixed block (408), the bottom end face of the fixed block (408) is provided with a mounting groove (409); An activity block (410) is sleeved on the side wall of the output shaft (404), the top end face of the activity block (410) is fixedly connected with a spring (411); A limiting block (413) is fixedly connected to the inner wall of the sliding groove (3), the end of the elastic telescopic rod (412) away from the inner wall of the sliding groove (3) is fixedly connected with the limiting block (413).

2. A milling structure for a numerically controlled machining center according to claim 1, characterized in that: The bottom end face of the activity block (410) is fixedly connected with a connecting ring (5), the outer diameter of the connecting ring (5) is equal to that of the activity block (410).

3. The milling structure for a CNC machining center according to claim 1, characterized in that: The bottom end face of the moving block (405) is fixedly connected with a tool bit (6), the limiting assembly (4) and the tool bit (6) are provided with several groups, and the limiting assembly (4) and the tool bit (6) are arranged at equal intervals in a circle on the side wall of the tool holder (2).

4. The milling structure for a CNC machining center according to claim 1, characterized in that: The cross section of the guide block (407) is inverted trapezoidal, the cross section of the activity block (410) is trapezoidal, the guide block (407) is movably connected with the limiting block (413), and the activity block (410) is movably connected with the limiting block (413).

5. The milling structure for a CNC machining center according to claim 1, characterized in that: One end of the spring (411) away from the activity block (410) is fixedly connected to the inside top face of the mounting groove (409), and the spring (411) is sleeved on the outer wall of the output shaft (404).

6. The milling structure for a CNC machining center according to claim 2, characterized in that: The guide block (407) is provided with a large diameter end and a small diameter end, and the large diameter end is equal to the inner diameter of the connecting ring (5).

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